Saturday 22 May 2010

Wseas Transactions

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Transactions: WSEAS TRANSACTIONS ON FLUID MECHANICS
Transactions ID Number: 89-843
Full Name: Nelu-Cristian Chereches
Position: Lecturer
Age: ON
Sex: Male
Address: Technical University Gh. Asachi, Faculty of Civil Engineering, 45A, D. Mangeron, 7000500, Iasi
Country: ROMANIA
Tel: 0040721976791
Tel prefix:
Fax:
E-mail address: chereches@tuiasi.ro
Other E-mails: cristi_chereches@yahoo.com
Title of the Paper: Study of natural convection flow in a double-skin facade
Authors as they appear in the Paper: Dan Ospir, Catalin Popovici, Cristian Chereches, Catalin Popa, Stephane Fohanno
Email addresses of all the authors: confortinstaliasi@gmail.com, catalinpopovici@climatherm.ro, chereches@tuiasi.ro, catalin.popa@univ-reims.fr, stephane.fohanno@univ-reims.fr
Number of paper pages: 10
Abstract: A dynamical study of the flow in an asymmetrically heated vertical plane channel was carried out experimentally and numerically. The experiments are carried out in water for modified Rayleigh numbers (Ra*) in a range corresponding to the boundary layer flow regime. Velocity profiles show the asymmetric and laminar character of the flow. The dynamic structure of the flow is characterized by using a visualization technique based on laser tomography (Particle Tracking Velocimetry) using discrete tracers to observe simultaneously the boundary layer flow and the reverse flow when it appears. The presence of a recirculation zone at the channel outlet near the unheated wall has been highlighted. These results are compared to a numerical simulation of the flow by using the laminar model. This simulation allows finding the patterns of the recirculation zone but with a maximum 6% overestimation of the recirculation length. The investigations focus specifically on the influen!
ce of the aspect ratio (Rf) and the modified Rayleigh number (Ra*) on the structure of the flow.
Keywords: Double skin, Natural convection, Numerical simulation, Visualization technique, Recirculation zone, Vertical channel, Wall flux, Laminar flow
EXTENSION of the file: .doc
Special (Invited) Session: Flow dynamics in a double-skin facade
Organizer of the Session: 634-123R
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